WebMIDI: Add MIDIOptions dictionary

Source/bindings/modules/v8/BUILD.gn

Index: Source/bindings/modules/v8/BUILD.gn
diff --git a/Source/bindings/modules/v8/BUILD.gn b/Source/bindings/modules/v8/BUILD.gn
index b5a2470bf7091b8b41e03099e5754d4604b120a0..b49c3077f2f54e831688384df149e59911e12980 100644
--- a/Source/bindings/modules/v8/BUILD.gn
+++ b/Source/bindings/modules/v8/BUILD.gn
@@ -18,7 +18,7 @@ group("bindings_modules_generated") {
 
 # bindings_modules_generated_aggregate in modules/v8/generated.gyp
 aggregate_generated_bindings("bindings_modules_generated_aggregate") {
-  sources = modules_idl_files
+  sources = modules_definition_idl_files
   component_dir = "modules"
   outputs = bindings_modules_generated_aggregate_files
 }
@@ -26,7 +26,13 @@ aggregate_generated_bindings("bindings_modules_generated_aggregate") {
 # bindings_modules_generated_individual in modules/v8/generated.gyp
 idl_compiler("bindings_modules_generated_individual") {
   # Note in GYP this is modules_interface_idl_files but this variable is just
-  # defined to modules_idl_files.
-  sources = modules_idl_files
+  # defined to modules_definition_idl_files.
+  sources = modules_definition_idl_files
   output_dir = bindings_modules_v8_output_dir
 }
+
+# bindings_modules_dictionary_impl_generated in modules/v8/generated.gyp
+idl_dictionary("bindings_modules_dictionary_impl_generated") {
+  sources = modules_dictionary_idl_files
+  outputs = generated_modules_dictionary_files
+}